In the Last 50 Years,the Greatest Progress in Addressing Worldwide

question 40

Multiple Choice

In the last 50 years,the greatest progress in addressing worldwide hunger and malnutrition came from the

• A)use of better transportation methods to export grain more efficiently.
• B)development and use of new varieties of high-yielding wheat and rice.
• C)reduced reliance on pesticides,herbicides,and chemical fertilizers.
• D)widespread use of sustainable irrigation methods.

---

Definitions:

Pearson's Product-moment Correlation Coefficient

A measure of the linear correlation between two variables X and Y, providing a value between +1 and -1 inclusive.

Frequency Distribution

A method for illustrating how often scores occur in groups called class intervals.

Frequency Polygon

A graphical representation of a frequency distribution that uses a continuous line to show the number of values that fall within a class interval.

Histogram

A graphical representation of a frequency distribution that uses bars of different heights to show the number of values that fall within each class interval.